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[PMID]:27403872
[Au] Autor:An W; Guo F; Song Y; Gao N; Bai S; Dai J; Wei H; Zhang L; Yu D; Xia M; Yu Y; Qi M; Tian C; Chen H; Wu Z; Zhang T; Qiu D
[Ad] Endereço:Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China.
[Ti] Título:Comparative genomics analyses on EPS biosynthesis genes required for floc formation of Zoogloea resiniphila and other activated sludge bacteria.
[So] Source:Water Res;102:494-504, 2016 Oct 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Activated sludge (AS) process has been widely utilized for municipal sewage and industrial wastewater treatment. Zoolgoea and its related floc-forming bacteria are required for formation of AS flocs which is the key to gravitational effluent-and-sludge separation and AS recycling. However, little is known about the genetics, biochemistry and physiology of Zoogloea and its related bacteria. This report deals with the comparative genomic analyses on two Zoogloea resiniphila draft genomes and the closely related proteobacterial species commonly found in AS. In particular, the metabolic processes involved in removal of organic matters, nitrogen and phosphorus were analyzed. Furthermore, it is revealed that a large gene cluster, encoding eight glycosyltransferases and other proteins involved in biosynthesis and export of extracellular polysaccharides (EPS), was required for floc formation. One of the two asparagine synthase paralogues, associated with this EPS biosynthesis gene cluster, was required for floc formation in Zoogloea. Similar EPS biosynthesis gene cluster(s) were identified in the genome of other AS proteobacteria including polyphosphate-accumulating Candidatus Accumulibacter phosphatis (CAP) and nitrifying Nitrosopira and Nitrosomonas bacteria, but the gene composition varies interspecifically and intraspecifically. Our results indicate that floc formation of desired AS bacteria, including CAP strains, facilitate their recruitment into AS and gradual enrichment via repeated AS settling and recycling processes.
[Mh] Termos MeSH primário: Esgotos/química
Zoogloea
[Mh] Termos MeSH secundário: Bactérias
Floculação
Genômica
Eliminação de Resíduos Líquidos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Sewage)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170807
[Lr] Data última revisão:
170807
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160713
[St] Status:MEDLINE


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[PMID]:27187569
[Au] Autor:Ma SJ; Ding LL; Huang H; Geng JJ; Xu K; Zhang Y; Ren HQ
[Ad] Endereço:State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, Jiangsu, PR China.
[Ti] Título:Effects of DO levels on surface force, cell membrane properties and microbial community dynamics of activated sludge.
[So] Source:Bioresour Technol;214:645-52, 2016 Aug.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:In this paper, we employ atomic force microscopy (AFM), fluorescence recovery after photobleaching (FRAP) technique, phospholipid fatty acids (PLFA) and MiSeq analysis to study the effects of traditional dissolved oxygen (DO) levels (0.71-1.32mg/L, 2.13-3.02mg/L and 4.31-5.16mg/L) on surface force, cell membrane properties and microbial community dynamics of activated sludge. Results showed that low DO level enhanced the surface force and roughness of activated sludge; the medium DO level decreased cell membrane fluidity by reducing the synthesis of branched fatty acids in the cell membrane; high DO level resulted in the highest protein content in the effluent by EEM scanning. Abundance of Micropruina, Zoogloea and Nakamurella increased and Paracoccus and Rudaea decreased with the increase of DO levels. RDA analysis suggested that saturated fatty acids (SFA), anteiso-fatty acids (AFA) and iso-fatty acids (IFA) were closely related to effluent quality as well as some genera.
[Mh] Termos MeSH primário: Consórcios Microbianos/fisiologia
Oxigênio/metabolismo
Esgotos/química
Esgotos/microbiologia
[Mh] Termos MeSH secundário: Actinomycetales/metabolismo
Membrana Celular/química
Membrana Celular/metabolismo
Ácidos Graxos/química
Ácidos Graxos/metabolismo
Recuperação de Fluorescência Após Fotodegradação
Cocos Gram-Positivos/metabolismo
Microscopia de Força Atômica
Fosfolipídeos/análise
Fosfolipídeos/metabolismo
Eliminação de Resíduos Líquidos/métodos
Zoogloea/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Fatty Acids); 0 (Phospholipids); 0 (Sewage); S88TT14065 (Oxygen)
[Em] Mês de entrada:1612
[Cu] Atualização por classe:161230
[Lr] Data última revisão:
161230
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160518
[St] Status:MEDLINE


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[PMID]:26615496
[Au] Autor:Ailijiang N; Chang J; Liang P; Li P; Wu Q; Zhang X; Huang X
[Ad] Endereço:State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China.
[Ti] Título:Electrical stimulation on biodegradation of phenol and responses of microbial communities in conductive carriers supported biofilms of the bioelectrochemical reactor.
[So] Source:Bioresour Technol;201:1-7, 2016 Feb.
[Is] ISSN:1873-2976
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Conductive carbon felts (Cf) were used as biofilm carriers in bioelectrochemical reactors to enhance the electrical stimulation on treatment of phenol-containing synthetic wastewater. In batch test, phenol biodegradation was accelerated under an optimum direct current (DC), which was 2mA for Cf biofilm carriers, lower than that for non-conductive white foam carriers. The stimulation effect was consistent with Adenosine Triphosphate contents in biofilms. The long-term operation further demonstrated that a high and stable phenol removal efficiency could be achieved with applied DC of 2mA, and intermittent DC application was better than continuous one, with phenol removal efficiency of over 97%. Although the quantities of whole microbial communities kept at a high level under all conditions, special microorganisms related with genera of Zoogloea and Desulfovibrio were distinctively enriched under intermittent applied DC pattern. This study shows that the electrical stimulation is potentially effective for biofilm reactors treating phenol-containing wastewater.
[Mh] Termos MeSH primário: Biofilmes
Reatores Biológicos
Consórcios Microbianos/fisiologia
Fenóis/química
Águas Residuais/química
Purificação da Água/métodos
[Mh] Termos MeSH secundário: Trifosfato de Adenosina/química
Biodegradação Ambiental
Carbono/química
Desulfovibrio/fisiologia
Estimulação Elétrica
Zoogloea/fisiologia
[Pt] Tipo de publicação:EVALUATION STUDIES; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Phenols); 0 (Waste Water); 0 (carbon fiber); 7440-44-0 (Carbon); 8L70Q75FXE (Adenosine Triphosphate)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170126
[Lr] Data última revisão:
170126
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:151130
[St] Status:MEDLINE


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[PMID]:25946341
[Au] Autor:Huang TL; Zhou SL; Zhang HH; Bai SY; He XX; Yang X
[Ad] Endereço:School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China. huangtinglin@xauat.edu.cn.
[Ti] Título:Nitrogen Removal Characteristics of a Newly Isolated Indigenous Aerobic Denitrifier from Oligotrophic Drinking Water Reservoir, Zoogloea sp. N299.
[So] Source:Int J Mol Sci;16(5):10038-60, 2015 May 04.
[Is] ISSN:1422-0067
[Cp] País de publicação:Switzerland
[La] Idioma:eng
[Ab] Resumo:Nitrogen is considered to be one of the most widespread pollutants leading to eutrophication of freshwater ecosystems, especially in drinking water reservoirs. In this study, an oligotrophic aerobic denitrifier was isolated from drinking water reservoir sediment. Nitrogen removal performance was explored. The strain was identified by 16S rRNA gene sequence analysis as Zoogloea sp. N299. This species exhibits a periplasmic nitrate reductase gene (napA). Its specific growth rate was 0.22 h-1. Obvious denitrification and perfect nitrogen removal performances occurred when cultured in nitrate and nitrite mediums, at rates of 75.53%±1.69% and 58.65%±0.61%, respectively. The ammonia removal rate reached 44.12%±1.61% in ammonia medium. Zoogloea sp. N299 was inoculated into sterilized and unsterilized reservoir source waters with a dissolved oxygen level of 5-9 mg/L, pH 8-9, and C/N 1.14:1. The total nitrogen removal rate reached 46.41%±3.17% (sterilized) and 44.88%±4.31% (unsterilized). The cell optical density suggested the strain could survive in oligotrophic drinking water reservoir water conditions and perform nitrogen removal. Sodium acetate was the most favorable carbon source for nitrogen removal by strain N299 (p<0.05). High C/N was beneficial for nitrate reduction (p<0.05). The nitrate removal efficiencies showed no significant differences among the tested inoculums dosage (p>0.05). Furthermore, strain N299 could efficiently remove nitrate at neutral and slightly alkaline and low temperature conditions. These results, therefore, demonstrate that Zoogloea sp. N299 has high removal characteristics, and can be used as a nitrogen removal microbial inoculum with simultaneous aerobic nitrification and denitrification in a micro-polluted reservoir water ecosystem.
[Mh] Termos MeSH primário: Desnitrificação
Água Potável/química
Zoogloea/metabolismo
[Mh] Termos MeSH secundário: Proteínas de Bactérias/genética
Proteínas de Bactérias/metabolismo
Água Potável/microbiologia
Água Subterrânea/microbiologia
Nitrato Redutase/genética
Nitrato Redutase/metabolismo
RNA Ribossômico/genética
Purificação da Água/métodos
Zoogloea/genética
Zoogloea/isolamento & purificação
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Bacterial Proteins); 0 (Drinking Water); 0 (RNA, Ribosomal); EC 1.7.99.4 (Nitrate Reductase)
[Em] Mês de entrada:1602
[Cu] Atualização por classe:150617
[Lr] Data última revisão:
150617
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:150507
[St] Status:MEDLINE
[do] DOI:10.3390/ijms160510038


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[PMID]:25342113
[Au] Autor:Farkas M; Táncsics A; Kriszt B; Benedek T; Tóth EM; Kéki Z; Veres PG; Szoboszlay S
[Ad] Endereço:Department of Environmental Protection and Environmental Safety, Szent István University, Gödöllo, Hungary Regional University Center of Excellence in Environmental Industry, Szent István University, Gödöllo, Hungary.
[Ti] Título:Zoogloea oleivorans sp. nov., a floc-forming, petroleum hydrocarbon-degrading bacterium isolated from biofilm.
[So] Source:Int J Syst Evol Microbiol;65(Pt 1):274-9, 2015 Jan.
[Is] ISSN:1466-5034
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:A floc-forming, Gram-stain-negative, petroleum hydrocarbon-degrading bacterial strain, designated Buc(T), was isolated from a petroleum hydrocarbon-contaminated site in Hungary. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain Buc(T) formed a distinct phyletic lineage within the genus Zoogloea. Its closest relative was found to be Zoogloea caeni EMB43(T) (97.2% 16S rRNA gene sequence similarity) followed by Zoogloea oryzae A-7(T) (95.9%), Zoogloea ramigera ATCC 19544(T) (95.5%) and Zoogloea resiniphila DhA-35(T) (95.4%). The level of DNA-DNA relatedness between strain Buc(T) and Z. caeni EMB43(T) was 31.6%. Cells of strain Buc(T) are facultatively aerobic, rod-shaped, and motile by means of a polar flagellum. The strain grew at temperatures of 5-35 °C (optimum 25-28 °C), and at pH 6.0-9.0 (optimum 6.5-7.5). The predominant fatty acids were C16:0, C10 : 0 3-OH, C12:0 and summed feature 3 (C16 : 1ω7c and/or iso-C15 : 0 2-OH). The major respiratory quinone was ubiquinone-8 (Q-8) and the predominant polar lipid was phosphatidylethanolamine. The genomic DNA G+C content was 63.2 mol%. On the basis of the chemotaxonomic, molecular and phenotypic data, isolate Buc(T) is considered to represent a novel species of the genus Zoogloea, for which the name Zoogloea oleivorans sp. nov. is proposed. The type strain is Buc(T) ( =DSM 28387(T) =NCAIM B 02570(T)).
[Mh] Termos MeSH primário: Biofilmes
Petróleo/microbiologia
Filogenia
Zoogloea/classificação
[Mh] Termos MeSH secundário: Técnicas de Tipagem Bacteriana
Composição de Bases
Biodegradação Ambiental
DNA Bacteriano/genética
Ácidos Graxos/química
Hungria
Hidrocarbonetos/metabolismo
Dados de Sequência Molecular
Hibridização de Ácido Nucleico
Fosfatidiletanolaminas/química
RNA Ribossômico 16S/genética
Análise de Sequência de DNA
Ubiquinona/química
Zoogloea/genética
Zoogloea/isolamento & purificação
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (DNA, Bacterial); 0 (Fatty Acids); 0 (Hydrocarbons); 0 (Petroleum); 0 (Phosphatidylethanolamines); 0 (RNA, Ribosomal, 16S); 1339-63-5 (Ubiquinone); 39382-08-6 (phosphatidylethanolamine); CQA993F7P8 (ubiquinone 8)
[Em] Mês de entrada:1503
[Cu] Atualização por classe:161125
[Lr] Data última revisão:
161125
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:141025
[St] Status:MEDLINE
[do] DOI:10.1099/ijs.0.068486-0


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[PMID]:25478839
[Au] Autor:Kiema TR; Harijan RK; Strozyk M; Fukao T; Alexson SE; Wierenga RK
[Ad] Endereço:Faculty of Biochemistry and Molecular Medicine, Biocenter Oulu, University of Oulu, PO Box 3000, FIN-90014 Oulu, Finland.
[Ti] Título:The crystal structure of human mitochondrial 3-ketoacyl-CoA thiolase (T1): insight into the reaction mechanism of its thiolase and thioesterase activities.
[So] Source:Acta Crystallogr D Biol Crystallogr;70(Pt 12):3212-25, 2014 Dec 01.
[Is] ISSN:1399-0047
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Crystal structures of human mitochondrial 3-ketoacyl-CoA thiolase (hT1) in the apo form and in complex with CoA have been determined at 2.0 Å resolution. The structures confirm the tetrameric quaternary structure of this degradative thiolase. The active site is surprisingly similar to the active site of the Zoogloea ramigera biosynthetic tetrameric thiolase (PDB entries 1dm3 and 1m1o) and different from the active site of the peroxisomal dimeric degradative thiolase (PDB entries 1afw and 2iik). A cavity analysis suggests a mode of binding for the fatty-acyl tail in a tunnel lined by the Nß2-Nα2 loop of the adjacent subunit and the Lα1 helix of the loop domain. Soaking of the apo hT1 crystals with octanoyl-CoA resulted in a crystal structure in complex with CoA owing to the intrinsic acyl-CoA thioesterase activity of hT1. Solution studies confirm that hT1 has low acyl-CoA thioesterase activity for fatty acyl-CoA substrates. The fastest rate is observed for the hydrolysis of butyryl-CoA. It is also shown that T1 has significant biosynthetic thiolase activity, which is predicted to be of physiological importance.
[Mh] Termos MeSH primário: Acetil-CoA C-Aciltransferase/química
Mitocôndrias/enzimologia
[Mh] Termos MeSH secundário: Acetil-CoA C-Aciltransferase/metabolismo
Sequência de Aminoácidos
Sítios de Ligação
Domínio Catalítico
Coenzima A/química
Coenzima A/metabolismo
Cristalografia por Raios X
Seres Humanos
Mitocôndrias/química
Mitocôndrias/metabolismo
Modelos Moleculares
Dados de Sequência Molecular
Ligação Proteica
Conformação Proteica
Multimerização Proteica
Tioléster Hidrolases/química
Tioléster Hidrolases/metabolismo
Zoogloea/enzimologia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
EC 2.3.1.16 (Acetyl-CoA C-Acyltransferase); EC 3.1.2.- (Thiolester Hydrolases); SAA04E81UX (Coenzyme A)
[Em] Mês de entrada:1508
[Cu] Atualização por classe:141206
[Lr] Data última revisão:
141206
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:141206
[St] Status:MEDLINE
[do] DOI:10.1107/S1399004714023827


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[PMID]:23182667
[Au] Autor:Douterelo I; Sharpe RL; Boxall JB
[Ad] Endereço:Pennine Water Group, Department of Civil and Structural Engineering, Mappin Street, University of Sheffield, Sheffield S1 3JD, UK. i.douterelo@sheffield.ac.uk
[Ti] Título:Influence of hydraulic regimes on bacterial community structure and composition in an experimental drinking water distribution system.
[So] Source:Water Res;47(2):503-16, 2013 Feb 01.
[Is] ISSN:1879-2448
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Microbial biofilms formed on the inner-pipe surfaces of drinking water distribution systems (DWDS) can alter drinking water quality, particularly if they are mechanically detached from the pipe wall to the bulk water, such as due to changes in hydraulic conditions. Results are presented here from applying 454 pyrosequencing of the 16S ribosomal RNA (rRNA) gene to investigate the influence of different hydrological regimes on bacterial community structure and to study the potential mobilisation of material from the pipe walls to the network using a full scale, temperature-controlled experimental pipeline facility accurately representative of live DWDS. Analysis of pyrosequencing and water physico-chemical data showed that habitat type (water vs. biofilm) and hydraulic conditions influenced bacterial community structure and composition in our experimental DWDS. Bacterial community composition clearly differed between biofilms and bulk water samples. Gammaproteobacteria and Betaproteobacteria were the most abundant phyla in biofilms while Alphaproteobacteria was predominant in bulk water samples. This suggests that bacteria inhabiting biofilms, predominantly species belonging to genera Pseudomonas, Zooglea and Janthinobacterium, have an enhanced ability to express extracellular polymeric substances to adhere to surfaces and to favour co-aggregation between cells than those found in the bulk water. Highest species richness and diversity were detected in 28 days old biofilms with this being accentuated at highly varied flow conditions. Flushing altered the pipe-wall bacterial community structure but did not completely remove bacteria from the pipe walls, particularly under highly varied flow conditions, suggesting that under these conditions more compact biofilms were generated. This research brings new knowledge regarding the influence of different hydraulic regimes on the composition and structure of bacterial communities within DWDS and the implication that this might have on drinking water quality.
[Mh] Termos MeSH primário: Água Potável/microbiologia
Hidrologia/métodos
Methylophilus/crescimento & desenvolvimento
Pseudomonas/crescimento & desenvolvimento
Sphingomonadaceae/crescimento & desenvolvimento
Abastecimento de Água
[Mh] Termos MeSH secundário: Biofilmes/crescimento & desenvolvimento
Água Potável/química
Sequenciamento de Nucleotídeos em Larga Escala
Hidrologia/instrumentação
Methylophilus/classificação
Methylophilus/isolamento & purificação
Methylophilus/fisiologia
Viabilidade Microbiana
Tipagem Molecular
Oxalobacteraceae/classificação
Oxalobacteraceae/crescimento & desenvolvimento
Oxalobacteraceae/isolamento & purificação
Oxalobacteraceae/fisiologia
Análise de Componente Principal
Pseudomonas/classificação
Pseudomonas/isolamento & purificação
Pseudomonas/fisiologia
RNA Bacteriano/química
RNA Bacteriano/metabolismo
RNA Ribossômico 16S/química
RNA Ribossômico 16S/metabolismo
Reologia/métodos
Estações do Ano
Sphingomonadaceae/classificação
Sphingomonadaceae/isolamento & purificação
Sphingomonadaceae/fisiologia
Fatores de Tempo
Reino Unido
Qualidade da Água
Zoogloea/classificação
Zoogloea/crescimento & desenvolvimento
Zoogloea/isolamento & purificação
Zoogloea/fisiologia
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Drinking Water); 0 (RNA, Bacterial); 0 (RNA, Ribosomal, 16S)
[Em] Mês de entrada:1306
[Cu] Atualização por classe:161125
[Lr] Data última revisão:
161125
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:121128
[St] Status:MEDLINE


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[PMID]:21875070
[Au] Autor:McIlroy SJ; Speirs LB; Tucci J; Seviour RJ
[Ad] Endereço:Biotechnology Research Centre, Department of Pharmacy and Applied Science, La Trobe University, Bendigo, Victoria, Australia.
[Ti] Título:In situ profiling of microbial communities in full-scale aerobic sequencing batch reactors treating winery waste in australia.
[So] Source:Environ Sci Technol;45(20):8794-803, 2011 Oct 15.
[Is] ISSN:1520-5851
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:On-site aerobic sequencing batch reactor (SBR) treatment plants are implemented in many Australian wineries to treat the large volumes of associated wastewater they generate. Yet very little is known about their microbiology. This paper represents the first attempt to analyze the communities of three such systems sampled during both vintage and nonvintage operational periods using molecular methods. Alphaproteobacterial tetrad forming organisms (TFO) related to members of the genus Defluviicoccus and Amaricoccus dominated all three systems in both operational periods. Candidatus 'Alysiosphaera europaea' and Zoogloea were codominant in two communities. Production of high levels of exocellular capsular material by Zoogloea and Amaricoccus is thought to explain the poor settleability of solids in one of these plants. The dominance of these organisms is thought to result from the high COD to N/P ratios that characterize winery wastes, and it is suggested that manipulating this ratio with nutrient dosing may help control the problems they cause.
[Mh] Termos MeSH primário: Reatores Biológicos/microbiologia
Eliminação de Resíduos Líquidos/métodos
Vinho
[Mh] Termos MeSH secundário: Aerobiose
Alphaproteobacteria/metabolismo
Austrália
Zoogloea/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1202
[Cu] Atualização por classe:111013
[Lr] Data última revisão:
111013
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:110831
[St] Status:MEDLINE
[do] DOI:10.1021/es2018576


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[PMID]:21107441
[Au] Autor:Jiang Y; Marang L; Kleerebezem R; Muyzer G; van Loosdrecht MC
[Ad] Endereço:Department of Biotechnology, Delft University of Technology, Julianalaan 67, Delft, The Netherlands.
[Ti] Título:Effect of temperature and cycle length on microbial competition in PHB-producing sequencing batch reactor.
[So] Source:ISME J;5(5):896-907, 2011 May.
[Is] ISSN:1751-7370
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:The impact of temperature and cycle length on microbial competition between polyhydroxybutyrate (PHB)-producing populations enriched in feast-famine sequencing batch reactors (SBRs) was investigated at temperatures of 20 °C and 30 °C, and in a cycle length range of 1-18 h. In this study, the microbial community structure of the PHB-producing enrichments was found to be strongly dependent on temperature, but not on cycle length. Zoogloea and Plasticicumulans acidivorans dominated the SBRs operated at 20 °C and 30 °C, respectively. Both enrichments accumulated PHB more than 75% of cell dry weight. Short-term temperature change experiments revealed that P. acidivorans was more temperature sensitive as compared with Zoogloea. This is particularly true for the PHB degradation, resulting in incomplete PHB degradation in P. acidivorans at 20 °C. Incomplete PHB degradation limited biomass growth and allowed Zoogloea to outcompete P. acidivorans. The PHB content at the end of the feast phase correlated well with the cycle length at a constant solid retention time (SRT). These results suggest that to establish enrichment with the capacity to store a high fraction of PHB, the number of cycles per SRT should be minimized independent of the temperature.
[Mh] Termos MeSH primário: Reatores Biológicos/microbiologia
Hidroxibutiratos/metabolismo
Microbiologia Industrial
Temperatura Ambiente
[Mh] Termos MeSH secundário: Bactérias/crescimento & desenvolvimento
Bactérias/metabolismo
Biomassa
Zoogloea/crescimento & desenvolvimento
Zoogloea/metabolismo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Hydroxybutyrates)
[Em] Mês de entrada:1108
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:101126
[St] Status:MEDLINE
[do] DOI:10.1038/ismej.2010.174


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[PMID]:20809924
[Au] Autor:Goyal D; Zhang XJ; Rooney-Varga JN
[Ad] Endereço:Department of Biological Sciences, University of Massachusetts, Lowell, MA 01854, USA.
[Ti] Título:Impacts of single-walled carbon nanotubes on microbial community structure in activated sludge.
[So] Source:Lett Appl Microbiol;51(4):428-35, 2010 Oct.
[Is] ISSN:1472-765X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:AIMS: Single-walled carbon nanotubes (SWNTs) are likely to become increasingly widespread and yet their environmental impact is not well understood. The purpose of the current study was to evaluate the impact of SWNTs on microbial communities in a 'sentinel' environmental system, activated sludge batch-scale reactors. METHODS AND RESULTS: Triplicate batch reactors were exposed to SWNTs and compared to control reactors exposed to impurities associated with SWNTs. Automated ribosomal intergenic spacer analysis (ARISA) was used to assess bacterial community structure in each reactor. SWNT exposure was found to impact microbial community structure, while SWNT-associated impurities had no effect, compared to controls. 16S rRNA gene sequence analysis indicated that dominant phylotypes detected by ARISA included members of the families Sphingomonadaceae and Cytophagacaceae and the genus Zoogloea. ARISA results indicated an adverse impact of SWNTs on the sphingomonad relative to other community members. Changes in community structure also occurred in both SWNT-exposed and control reactors over the experimental time period and with the date on which activated sludge was obtained from a wastewater treatment facility. CONCLUSIONS: These results indicate that SWNTs differentially impact members of the activated sludge reactor bacterial community. SIGNIFICANCE AND IMPACT OF THE STUDY: The finding that community structure was affected by SWNTs indicates that this emerging contaminant differentially impacted members of the activated sludge bacterial community and raises the concern that SWNTs may also affect the services it provides.
[Mh] Termos MeSH primário: Ecossistema
Nanotubos de Carbono
Esgotos/microbiologia
Eliminação de Resíduos Líquidos/métodos
[Mh] Termos MeSH secundário: Reatores Biológicos
Cytophagaceae/genética
Cytophagaceae/crescimento & desenvolvimento
DNA Bacteriano/genética
DNA Espaçador Ribossômico/análise
DNA Espaçador Ribossômico/genética
Dados de Sequência Molecular
Reação em Cadeia da Polimerase
RNA Ribossômico 16S/genética
Análise de Sequência de DNA
Sphingomonadaceae/genética
Sphingomonadaceae/crescimento & desenvolvimento
Zoogloea/genética
Zoogloea/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (DNA, Bacterial); 0 (DNA, Ribosomal Spacer); 0 (Nanotubes, Carbon); 0 (RNA, Ribosomal, 16S); 0 (Sewage)
[Em] Mês de entrada:1101
[Cu] Atualização por classe:111117
[Lr] Data última revisão:
111117
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:100903
[St] Status:MEDLINE
[do] DOI:10.1111/j.1472-765X.2010.02913.x



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